2.2.34 [HTML] Section 17.2, Controls

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C0025:

The specification states:

 A control's initial value does not change. Thus, when a form is reset, each 
 control's current value is reset to its initial value. If a control does not have 
 an initial value, the effect of a form reset on that control is undefined.

All Document Modes (All Versions)

When a form is reset, controls without default values are set to empty values.